DINOSAUJiS. 103 



these unarmoured Dinosaurs were molested and preyed upon by 

 their carnivorous contemporaries, such as the fierce Megalo- 

 saurus, previously described (p. 76). And with regard to this, Mr. 

 Dollo makes the suggestion that, when on land, their great height 

 and erect posture enabled them to descry such enemies a long 

 way off. Their great height must also have stood them in good 

 stead, by enabling them easily to reach the leaves of trees, tree- 

 ferns, cycads, and other forms of vegetable life, which constituted 

 their daily food. (See restorations, Plates VII. and VIII.) 



Should the reader visit the " geological island" in the grounds 

 of the Crystal Palace, he will see that Mr. Waterhouse Hawkins's 

 great model Iguanodon there set up is by no means in accord- 

 ance with the description given above ; but we must remember 

 how imperfect was the material at his command. 



Another Dinosaur, of considerable dimensions, that flourished 

 during the Wealden period was the Hylseosaurus, also discovered 

 by Dr. Mantell, and so named by him because it came from the 

 Weald.^ In the summer of 1832, upon visiting a quarry in 

 Tilgate Forest, which had yielded many organic remains, he 

 perceived in some fragments of a large mass of stone which had 

 recently been broken up and thrown in the roadside, traces of 

 numerous pieces of bone. With great care he cemented together 

 and fixed in a stout frame, all the portions of this block that he 

 could find, and set to work to " develop " the block with his 

 chisel. This work occupied many weeks, but his labour was 

 rewarded by the discovery of certain new and remarkable features 

 displayed by this monster ; for it must have presented, when alive, 

 a formidable array of bony plates and long sharp spines, the 

 latter of which probably stood in bristhng array along the back 

 and tail, and other parts of the body. (Wall-case 4.) Of the 

 spines no less than ten were found in this block, varying in 

 length from five to seventeen inches, the largest being four 

 inches thick. It is known that many lizards, such as Iguanas 

 ' From Greek — huk, wood, or weald ; and sauios, lizard. 



